Louis Li 's Blog

1/1: On this day in history, transmission control protocol...

noreply@blogger.com (Louis Li) — Tue, 1 Jan 2008 03:29:00 -0800

Did you know? TCP/IP is the basis of almost all Internet communication, and it was adopted by ARPANET on January 1 (if you don't know, ARPANET was the major foundation to the Internet).

Since the Internet is just a series of smaller networks, which are just series of computers, all the computers need to speak the same protocol (think of it as a language). This is where IP comes in:

IP ensures that packets are routed to the right place. You can think of a packet as a package of information, and on this package IP holds information about the address and sender (note: your IP address, a number that identifies your computer online is contained in the IP portion of the packet).

When you type in "http://www.facebook.com" you ask facebook's servers (computers) to show you its login page. However, your request must typically travel through 10 network nodes (routers) or more before finally reaching the facebook servers.

TCP

is a "protocol" built on top of IP (every TCP/IP packet has an IP portion). TCP's entire job is ensuring that the connection occurs in an organized matter. To understand TCP's purpose, let's reconsider the package analogy. Say you have to send a script over the "normal" snail mail, and for whatever reason you have to send it in 2 separate packages. This occurs in TCP/IP all the time. So, it's up to the receiver to arrange the individual packages into one whole package. TCP/IP connections have been handled with TCP/IP handshakes since January 1, 1983.

Al Gore invented the Internet in 1994.

The TCP/IP Handshake
Take a look at the confetti at the bottom of the Google logo, "SYN SYN ACK ACK." is part of the "TCP/IP handshake."

January 1, 83 TCP/IP

This article gives a more in-depth look at what TCP/IP is. It was established as an ARPANET standard on January 1, 1983.

TCP/IP:

IP - is responsible for moving packet of data from node to node. IP forwards
each packet based on a four byte destination address (the IP number). The
Internet authorities assign ranges of numbers to different organizations.
The
organizations assign groups of their numbers to departments. IP operates
on
gateway machines that move data from department to organization to region
and
then around the world.
TCP - is responsible for verifying the
correct
delivery of data from client to server. Data can be lost in the
intermediate
network. TCP adds support to detect errors or lost data and to
trigger
retransmission until the data is correctly and completely received.
Sockets
- is a name given to the package of subroutines that provide
access to TCP/IP on
most systems.
(Yale.edu)

There are many layers built ontop of TCP/IP. And another protocol called UDP, which is predominatly used in games and other networking situations where low-latency is required is completely different.

The major layers on top of TCP/IP are:

HTTP: Hyper Text Transfer Protocol (for requesting webpages)

FTP: File Transfer Protocol (for uploading files to websites)

SMTP and POP3: For sending (SMTP) and receiving (POP3) e-mail

IRC: For chatting online

There are also many-non standard protocols built on top of TCP/IP. For instance, AOL Instant Messenger uses a third-party protocol to transfer chat messages between clients!

Khi co don em nho ai - China music

noreply@blogger.com (Louis Li) — Tue, 1 Jan 2008 03:02:00 -0800

Building Websites with Joomla! 1.5 Beta 1

noreply@blogger.com (Louis Li) — Tue, 18 Dec 2007 06:23:00 -0800

This book provides you with step by step instructions on working with Joomla! 1.5. This book not only covers the customization of Joomla! but also teaches you to create your own templates, components, and finally your own website. This book is based on beta 1.5 version and hence it is advisable not to use it for production server. The book does not aim to cover every feature of Joomla! nor is it a comprehensive guide to extending Joomla!.

Building Websites with Joomla! v1.0

noreply@blogger.com (Louis Li) — Tue, 18 Dec 2007 06:18:00 -0800

This book is a fast paced tutorial to creating a website using Joomla!. If you’ve never used Joomla!, or even any web content management system before, then this book will walk you through each step in a friendly and accessible way. From installation, to initial set up and content entry and then on to customization for your own look and feel, this book will get you to a stable and working Joomla! based web site fast. You don’t have to be an experienced web developer or designer to get a great looking site with a full set of functions using this book and Joomla! This book will guide through every step.

Beginning Joomla!: From Novice to Professional (Beginning from Novice to Professional)

noreply@blogger.com (Louis Li) — Tue, 18 Dec 2007 05:09:00 -0800

Do you want the ability to manage documents, photos, and other content over the Web but don't want to shell out thousands of dollars in proprietary solutions? Want to create an online community for your hobby or user group? You're not alone. For thousands of like-minded around the globe, the answer is Joomla!, an open source content management system used to manage all sorts of data over the Web.

Make a Joomla Template in 5 Easy Steps

noreply@blogger.com (Louis Li) — Tue, 18 Dec 2007 05:03:00 -0800

A fantastic 91 page e-book detailing in 5 easy steps how to create your own Joomla template. Written for complete beginners and needing no expensive software or graphic design knowledge the e-book shows you how to create a Joomla template.

Professional Joomla!

noreply@blogger.com (Louis Li) — Tue, 18 Dec 2007 04:49:00 -0800

Professional Joomla walks the reader through Joomla, an open content management system that is rapidly growing in popularity. Readers will quickly advance from installation, integration, and set-up topics to digging into the underlying PHP and MySQL whose flexibility is driving the growth of the platform. Readers will explore load balancing, log tracking, and even search engine optimization. From a user standpoint, Joomla offers tremendous ease of use and simplicity. The elegant dashboard based upon the KDE interface allows content to be updated in minutes and data to flow freely from outside sources. Administrators and developers have he capability to customize virtually every aspect of the platform. For this reason extra attention is given to topics like plug-ins, the API, design and skinning, and integration with existing databases, websites, and web services.

Joomla! 1.0 Content Management System Quick Start Guide

noreply@blogger.com (Louis Li) — Tue, 18 Dec 2007 04:36:00 -0800

Greetings!

The Joomla! Web Content Management System (CMS) allows the content manager or author, who may not know HTML or any other programming language, to manage the creation, modification, and removal of content from their Website without needing the expertise of a Webmaster. The most important thing you need to know is that having a CMS is about using the web with purpose – for your business and your bottom line.

The software behind the CMS takes the content that is entered and compiles it so that the Website is instantly updated. The features of Web CMS’s vary, but most include Web-based publishing, format management, revision control, and indexing, search, and retrieval functions.

The Joomla! CMS has a wide range of features and layout options, and works with a huge range of modules and components to give you and your users extra functionality.

Web 2.0 Logos

noreply@blogger.com (Louis Li) — Mon, 10 Dec 2007 09:43:00 -0800

Web 2.0 Logos - part I

Web 2.0 Logos - part II

Chinese Web 2.0 Logos

fabiofco's

noreply@blogger.com (Louis Li) — Mon, 10 Dec 2007 09:10:00 -0800

Google´s facility >>

Advanced research - Pesquisa avançada >>

Jay Chou - Twilight's Chapter 7

noreply@blogger.com (Louis Li) — Mon, 10 Dec 2007 08:29:00 -0800

浪費資源

noreply@blogger.com (Louis Li) — Mon, 10 Dec 2007 08:10:00 -0800

真是每一天都有令人驚喜萬分的新奇事情，只要你多加留意，

再花一點時間去思考，就會發現更多。

最近又看到一篇有關環保的新聞，而重點就是離婚竟會對環境做成破壞！

據研究指出，道理其實十分簡單，就是因為原本的家庭一分為二，

做成浪費資源，令到土地、食物、能源的消耗增大。

一家人同住一屋，冷氣、暖氣、雪櫃、電視、煮食爐都是大家共用的，

絕對是有益於環境，但相反兩人分居後，就必須多用一間屋，

所有以往共用的傢俬都要多出一組，一切資源都會消耗更多……

實在是簡單的道理，卻也因為太簡單而令人有所忽略。

我不禁在想，若大家已長大或成人搬離父母自己獨居，

又是否要計算在浪費資源之上呢？

畢竟，每人年輕的時候，也總希望有一段獨自生活的經歷呢！

相同地，人面對再熱鬧再高興的時刻，

還是需要偶然獨處下來，讓心靜靜的休息。>>

Some Logooward winners

noreply@blogger.com (Louis Li) — Mon, 10 Dec 2007 07:06:00 -0800

Google Moogle

Dalibor Kos, Croatia
:: no URL ::

Euro-Google
by Johannes Schubert, 21 year-old,Berlin, Germany
::URL not available ::

Google Red Sox
by Brian Watson
:: http://bwats2.blogspot.com ::

Pimple
by Harris
::http://www.dolbydesigns.com ::

Periodic Table Quiz

noreply@blogger.com (Louis Li) — Sun, 9 Dec 2007 10:06:00 -0800

Contains 600 questions designed to test your knowledge of the Periodic Table; the elements and thier properties. Many different styles of question on a variety of different topics. Includes picture questions!

Contains questions on...
Symbol
Atomic number
atomic weight
Periodic Table trends
discovery information (who, when and where)
grouping detail
boiling point
melting point
density
state at 298K, 1 atmosphere pressure
colour
electron configuration
atomic volume
electronegativity (Pauling scale)
magnetic ordering
speed of sound
energy levels

http://www.freshney.org/education/ptq/index.htm

Periodic Table Explorer

noreply@blogger.com (Louis Li) — Sun, 9 Dec 2007 10:00:00 -0800

The PTE is a brand new way of exploring the periodic table. It has the same functions as the original Periodic Table software plus many more, it also has a completely new and innovative user interface that allows an almost unlimited amount of control over the display.

Each display can be opened any number of times, and can show different information. The size, shape and position of each display can be customised too.
You can save your favourite layouts for retrieval at a later date.

The Periodic Table Explorer comes in two versions.
Before downloading, please read the following;

Standard Version
The standard install contains the Periodic Table Explorer executable and necessary system files but NO data files, so you MUST have installed the Periodic Table (v3.1.0 or above) first. The original Periodic Table and the Explorer applications will be available to you should you wish to use both. Install this in the same directory as the original application (this is the default). If you want to have access to the explorer and the original then this is the best option.

Full Version
The full version contains the Periodic Table application and the latest version of the data files. Download this version if you have either an old set of data or you wish to install for the first time.

Features include:
Detailed information on each element
Details of isotopes and allotropes
Details of important compounds
Details of reactions with water, air, halogens and acids

Images for each element (126 images in total)
including valence and crystal stucture diagrams
Glossary of terms
Graphs of important element properties
Biographies for the important scientists and element discoverers
View the states of the elements at any temperature (from 0 - 6000k)
XP style support
Search through all content
Electron shell diagrams of each element
Atomic width diagram
Element names and the majority of the applications buttons are now available in eight different languages. Unfortunately there is just too much text for me to translate (95000+ words).

If you are using this Periodic Table in a school / college or other institue of learning and would like to add your own content, or customise existing content, then please click here http://www.freshney.org/education/pte/ined.htm

Periodic Table Classic

noreply@blogger.com (Louis Li) — Sun, 9 Dec 2007 09:43:00 -0800

The application contains all the elements of the Periodic Table along with images of the elements in their natural state, as well as lots of other information and interactive displays.

The periodic table now comes in three versions. They all contain the same amount of information.

Standard Version
Designed to be used on desktops set to 1024x768 or better. Contains many small images of most of the elements.

Extra Version
This is identical to the Standard Version except it comes with 155 high resolution images of the elements in various physical states.

Mini Version
This version contains the same smaller images that comes with the standard version, except that it's designed to be used on desktops of 800x600.

Features include:
Detailed information on each element
Details of isotopes and allotropes
Details of important compounds
Details of reactions with water, air, halogens and acids

Images for each element (126 images in total)
including valence and crystal stucture diagrams
Glossary of terms
Graphs of important element properties
Biographies for the important scientists and element discoverers
View the states of the elements at any temperature (from 0 - 6000k)
XP style support
Search through all content
Electron shell diagrams of each element
Atomic width diagram
Element names and the majority of the applications buttons are now available in eight different languages. Unfortunately there is just too much text for me to translate (95000+ words).

If you are using this Periodic Table in a school / college or other institue of learning and would like to add your own content, or customise existing content, then please click here http://www.freshney.org/education/pt/ined.htm